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Finding the Fourth Proportional to 1,107.56, 1,661.61 and 338.06

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Solution

The fourth proportional to 1,107.56, 1,661.61 and 338.06 is: 507.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.56 : 1,661.61 = 338.06 : x
  2. Step 2: Convert to fraction form
    1,107.56/1,661.61 = 338.06/x
  3. Step 3: Cross multiply
    1,107.56x = 1,661.61 × 338.06
  4. Step 4: Simplify right side
    1,107.56x = 561,729.30
  5. Step 5: Solve for x
    x = 561,729.30/1,107.56
  6. Step 6: Final answer
    x = 507.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.